US 11,719,841 B1
Timing alignment method for data acquired by monitoring units of borehole-surface micro-seismic monitoring system
Siyuan Gong, Xuzhou (CN); Qing Ge, Xuzhou (CN); and Linming Dou, Xuzhou (CN)
Assigned to CHINA UNIVERSITY OF MINING AND TECHNOLOGY, Xuzhou (CN); and Xuzhou Hongyi Technology Development Co., Ltd., Xuzhou (CN)
Filed by CHINA UNIVERSITY OF MINING AND TECHNOLOGY, Xuzhou (CN); and Xuzhou Hongyi Technology Development Co., Ltd., Xuzhou (CN)
Filed on Mar. 16, 2023, as Appl. No. 18/122,140.
Claims priority of application No. 202210586305.X (CN), filed on May 27, 2022.
Int. Cl. G01V 1/28 (2006.01); G04R 20/02 (2013.01)
CPC G01V 1/288 (2013.01) [G04R 20/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A timing alignment method for data acquired by monitoring units of a borehole-surface micro-seismic monitoring system, comprising the following steps:
(1) extracting a first rock-burst waveform data segment and a second rock-burst waveform data segment that are respectively acquired by a surface wireless monitoring unit and an underground wired monitoring unit of the borehole-surface micro-seismic monitoring system and each provided with multiple global positioning system (GPS) timestamps, wherein the first rock-burst waveform data segment and the second rock-burst waveform data segment have different lengths;
(2) calculating a time difference and a number of sampling points between each pair of adjacent GPS timestamps in each of the first rock-burst waveform data segment and the second rock-burst waveform data segment; and adding, on an equal-interval basis, a sampling time to a sampling point missing a timestamp between each pair of adjacent GPS timestamps;
(3) calculating an average sampling frequency of each of the first rock-burst waveform data segment and the second rock-burst waveform data segment; and adding, on an equal-interval basis, a sampling time to a sampling point missing a timestamp except first and last GPS timestamps in each of the first rock-burst waveform data segment and the second rock-burst waveform data segment;
(4) resampling sampling times of all sampling points obtained in steps (2) and (3), according to a uniform sampling frequency; and
(5) calculating, based on the sampling times of all of the sampling points obtained in steps (2) and (3) and rock-burst waveform data segments at the sampling times, a rock-burst waveform data segment at a new sampling time according to step (4) with a linear interpolation formula; and aligning the sampling times of the first rock-burst waveform data segment and the second rock-burst waveform data segment.